激活一个全新的 Office 产品密钥. 解决激活错误. 激活 Microsoft 365 或非订阅版本的 Office. 当启动未激活的 Microsoft 365 应用时，系统将提示登录到 Microsoft 365。 请务必使用用于购买或订阅 Microsoft 365 的 Microsoft 帐户或工作或学校帐户进行登录。 注意: 如果新设备上预安装了 Microsoft 365，请参阅 激活新 Windows 设备上预安装的 Office。 如果出现“激活”向导，则需要帮助激活 Microsoft 365。 按照向导中的提示激活 Microsoft 365。 使用“激活”向导获取激活 Office 的帮助.

获取最新 Windows 更新. Windows 设备可能会在不同时间获得新功能，因为 Microsoft 通过多种服务技术提供非安全更新、修补程序、改进和增强功能，包括 受控功能推出 (CFR)。. 如果你需要重启设备来完成更新，Windows 会通知你，你可以选择最适合你完成更新的时间 ...

更新可让 Surface 发挥其最佳性能。. 除了Windows 10或 Windows 11 的软件更新外，还必须进行硬件更新，也称为驱动程序和固件更新。. 可以使用 Surface 应用快速检查 Surface 驱动程序和固件的运行状况。. 打开 Surface 应用. 在 Surface 应用中，展开 帮助和支持 以检查更新 ...

Cast to a display from a Windows PC. You can wirelessly connect your PC to a TV, projector, or other kind of external display that supports Miracast. Turn on your TV, projector, or other display. If you're using a Miracast dongle or adapter, make sure it's plugged in to the display.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC. How to open PC Health Check. In Windows, use Search on the taskbar to ...

Updates keep your Surface performing its best. Along with software updates for Windows 10 or Windows 11, it's important to make hardware updates, also known as updates for drivers and firmware. You can quickly check the health of your Surface drivers and firmware using the Surface app. Open the Surface app.

Installation media, such as a USB flash drive, can be used to install a new copy of Windows, perform a clean installation of Windows, or reinstall Windows. To create installation media, go to the software download website, where step-by-step instructions can be found.

重新激活 Office 需要不同的步骤，具体取决于你的情况。 安装或重新安装. 注意: 如果你已拥有 Microsoft 365 或 Office 许可证，则可以登录到 Microsoft帐户“服务 & 订阅”页，并安装你拥有的产品 () 。 尝试安装引导演练： 尝试引导支持. 或者，如果要在现有或新的计算机上安装或重新安装 Microsoft 365 或 Office，请转到： 对于 Microsoft 365 和 Office 2021 - 在电脑或 Mac 上下载并安装Microsoft 365 或 Office 2021。 对于 Office 2019、2016 或 2013 - 下载并安装或重新安装 Office 2019、Office 2016 或 Office 2013。

Windows 11 is a service, which means it gets better through periodic feature updates. We take a phased and measured approach to rolling out every feature update. That means you’ll receive Windows 11, version 24H2 when data shows that your device is ready and that you will have a great update experience.

Download the offline installer from your account portal. To download the offline installer, go to www.office.com. If you're not already signed in with the Microsoft account associated with your copy of Microsoft 365 or Microsoft 365 do that now.